Cholera (3.5e Disease)

From D&D Wiki

Cholera causes massive dehydration which impairs the body's ability to function. It is caused by fecal matter in food or water, and is common in areas that are constrained due to circumstance (ships, jails, other isolated areas) or crowded areas with one water source. When using cholera in an adventure, the PC makes a Fortitude save of DC 18 or becomes fatigued and shaken. If said PC fails by more than 5 points, s/he is rendered prone and helpless; failure by more than 10 points results in death.